Tupac Shakur murder trial's first week sees heated testimony from reluctant witnesses with old gangland ties

The first week of Tupac Shakur’s long-awaited murder trial exposed the challenge prosecutors face nearly 30 years after his death — most of the key players are dead, others refuse to cooperate and their case rests heavily on the defendant's own words.

Duane "Keffe D" Davis, 63, is accused of providing the murder weapon used in a 1996 Las Vegas drive-by shooting that killed Shakur and wounded Death Row Records founder Marion "Suge" Knight. He is not accused of pulling the trigger. The trial...